Make config defaults seteable by environment variables if setup is running headless

Make config defaults seteable by environment variables if setup is running headless

these are the environment variables and their defaults:
uname(&my_utsname);
/* set some sample/default values in place of blanks... */
CITADEL_c_nodename=my_utsname.nodename
CITADEL_c_humannode=_("My System")
CITADEL_c_phonenum=_("US 800 555 1212")
CITADEL_c_initax=4
CITADEL_c_moreprompt="<more>"
CITADEL_c_twitroom="Trashcan"
CITADEL_c_baseroom=BASEROOM
CITADEL_c_aideroom="Aide"
CITADEL_c_port_number=504
CITADEL_c_sleeping=900
CITADEL_c_smtp_port=25
CITADEL_c_pop3_port=110
CITADEL_c_imap_port=143
CITADEL_c_msa_port=587
CITADEL_c_smtps_port=465
CITADEL_c_pop3s_port=995
CITADEL_c_imaps_port=993
CITADEL_c_pftcpdict_port=-1
CITADEL_c_managesieve_port=2020
CITADEL_c_xmpp_c2s_port=5222
CITADEL_c_xmpp_s2s_port=5269